While plywood is a versatile, strong, and durable material, it is not without disadvantages. Plywood is created by stacking alternating layers of thinly sliced wood and securing them with an adhesive. A number of plywood products have been introduced to replace standard lumber, such as laminated studs. Plymaster supplies a huge range of panelling, timber and building products for residential, commercial and industrial applications. Our product range includes plywood, MDF, veneers, laminated panels, signboards, decking and timber. Our experienced staff members can advise you on the best products to use for your particular needs and can advise you of the best way to approach the job at hand. We pride ourselves in providing customer satisfaction, exceptional and timely service, along with superior quality products at competitive prices. Our precision cutting service includes on-the-spot cutting for small orders, straight and complex cutting and CNC routering.
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When designing a stitch and glue hull for plywood composite construction and all developable panels, how can one predict how the plywood will bend? Modeling designs in Rhino is one thing but I have no idea whether the wood will conform to the developable shapes I am modeling.
Location: auckland nz bending ply Here's a jpeg of the bow sections of the CBSkimmer - in 4mm meranti plywood.
Bending ply requires some patience and slowly increasing clamp pressures, plus a few judicious saw cuts in a couple of high tensioned areas (but watch out the whole thing doesn't explode like a spiked balloon).
Location: maine To calculate how far a panel will bend, rip a strip of it and bend. I've done coamings without steaming by laying them between two supports for a couple of weeks in the summer with weight bowing them down. Location: Utah Can anyone offer any insight into the phenomenon I described in my last post? I would also be interested to know if there is a commonly used term for this phenomenon, which would allow me to search on it to find more info. If you take a cut across a simply curved surface in any direction other than perpendicular to the curvature plane, you will be cutting across some portion of the original curvature.


For prediction, I would imagine the amount is directly related to the angular difference between the section cut and the conic (if present) radial line or surface 0 isobend (don't know the term - 'contour' where bending = 0 ) factored by the amount of curvature or bending (perpendicular to the surface) that the panel has at that averaged (if twist) curvature location. The situation you are describing sounds to me like the conical development you will get anytime you induce twist into a rolled sheet.
I use several surface development software packages to design hulls, and I normally export the design data into Autocad to finish the drawing.
I normally draw a fair chine in elevation and plan and then adjust the keel profile to suit, while adjusting the origin points of the conic projection lines. If I haver had to alter the lines in Autocad, I then go back to Prosurf or Rhino and change the lines accordingly so I check the hydrostatics. What I have found is that performing a conic projection produces a possible conic solution to how the plates will sit, but it is not always the solution that the plates will find.
There may be (certainly are in fact) much smarter people out there who know things that I don't about developing accurate cross sections. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. This product can be used in a variety of different ways and is suitable for many applications.
Plywood is subject to a variety of problems, both from its unsuitability for certain purposes and from environmental hazards. Plywood comes in a variety of thicknesses, but the only means of changing the thickness to suit a particular need is by gluing sheets together. Because of the method used to construct plywood, it is stronger than most types of equally sized and shaped lumber.
We also provide a full delivery service in and around Sydney and can arrange delivery over longer distances if required. We can also arrange special machining such as perforations, slotting, slat walls and edging.
Other plys will bend even further, like Hoop pine and of course the expensive aircraft plies in 1.5 and 3mm guages.
Any sheet material with conform to what is called a developable surface, whic is essentially a section of either a cylinder or a cone (or combinations of cylinders and cones).
Unfortunately, this construction method also makes plywood easily damaged by exposure to water. When you bend a sheet of ply, alloy or steel around the chines and centreline of most boat shapes, you will induce some twist into the sheet. Even when used within the manufacturer’s specifications, plywood can and will fail eventually.


The thin layers of wood readily absorb water and, through capillary action, draw the water deep into the wood. Closer inspection usually reveals that the plywood had begun to fail long before, and only became evident when the failure was so pronounced that there was no alternative but to remove and replace the entire sheet.
Most of the twist is where the chines lead up toward the bow, which is why you notice the effect most there. The process of performing a conic development looks scary to a novice but gets earsier with practise.
Plywood can be custom-ordered in the same size and shape as other lumber if desired, but the expense is prohibitive. Marine-grade plywood is designed for boat sub-floors and other areas where moisture is frequently encountered, but the expense of such plywood precludes its use for other purposes. This compromise the integrity of both the wood and the adhesive used to hold the layers together. Plywood used in flooring also suffers from weathering, such as that caused by dampness under the house or flooding severe enough to soak the plywood. Autocad makes it much simpler, as the origin points of the cones can be dragged around to find the best origin points.
If you look at the frame sections superimposed on each other, as they are in the sections plan, then you will notice that the aft sections are more likely to be parallel and the front ones tend to fan apart.
I thought it would be useful to go over some of the different thickness plywood available on the market today. Plywood thicknesses vary drastically depending on the type of plywood and the use.Plywood can be divided into two different groups when it comes to thickness variations. I run their design-build division that specializes in custom homes, commercial design-build projects and sub-divisions.
I'm also a licensed civil and structural engineer with extensive experience in civil and structural design and home construction.
My hope is that I can share my experience in the home construction, home improvement and home renovation profession with other builders and home owners. Insulating basement walls in cold climates is a great way to keep your home warmer and drier.
Maybe it's time to refinish your deck or add some new decorative touches to your tired deck.



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